= W. Ellsworth
{c}
<W. Ellsworth> co-developed a <double-difference earthquake relocation> method with <F. Waldhauser>. Their algorithm compares differences in arrival times from nearby <earthquakes> recorded at common stations, reducing errors shared along similar propagation paths.<A Double-difference Earthquake Location Algorithm: Method and Application to the Northern Hayward Fault, California by F. Waldhauser and W. Ellsworth>[Abstract: differential travel times and relative hypocentral locations]{ref}
The result is improved relative location within an earthquake cluster, rather than an automatic exact absolute position. The distinction helps interpret fine fault geometry without confusing relative precision with the accuracy of the underlying <velocity model>.
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